Combined burner and scraper



Aug. 27, 1929. R, H, JQHNSON 1,726,027

COMBINED `BURNER AND SGRAiPER Filed July 5, 1928 ff. JO-7016021@A amy Fting snugly about the nozzle.

Patented Aug. '27, 1929.

UNITED STATES PATENT OFFICE.

ROBERT H. JOHNSON, OF WASHINGTON, DISTRICT OF COLUMBIA.

COMBINED BURNER AND SCRAPER.

Application led July 5, 1928.

- from painted surfaces and following the burning in one operation withthe removal of the burned paint by scraping.

Another object of the invention is to provide an attachment for a blowtorch which will acomplish the two-fold purpose above described and besimple and compact in construction and capable of an inexpensivemanufacture.

The device is so constructed and arranged as to remove the paint withoutinjuring the surface from which the paint was removed.

llVith the foregoing and other objects in view, the invention will bemore fully described hereinafter, and will be more particularly pointedout in the claims appended hereto.

In the drawings, wherein like symbols refer to like or correspondingparts throughout the several views,

Figure 1 is a side View of a blow torch showing the improved burner andscraper applied thereto.

Figure 2 is a longitudinal sectional view taken through the improveddevice and showing the blow torch nozzle in elevation.

Figure 3 is a cross sectional view taken on the line 3-3 in Figure 2.

Figure 4 is a similar view taken on the line 4-4 also in Figure 2, and

Figure 5 is a 'section taken on the line 5*5 in Figure 4.

Referring more particularly to the drawings 6 designates generally ablow torch of conventional type having the pump 7 for compressing airtherein, the perforated nozzle 8 and the needle valve 9.

In accordance with the invention a tube 10 is fitted over the end of thenozzle 8, such tube having a flange 11 at one end for fit- The other endof the tube is externally threaded, as indicated at 12, to receive theinternal threads upon the sleeve 13. This latter sleeve carries at itsouter end a plate having numerous perforations 14 therein. The diameterof the plate is preferably larger than that of the sleeve 13 and aflaring portion 16 connects the outer edge of the plate 14 with theadjacent end of the sleeve 13. lVithin this flaring portion 16 is aSerial No. 290,628.

chamber disposed between the end of the sleeve and the plate 15 whichare spaced apa-rt as shown in Figure 2. The sleeve 13 is traversed by anannular series of air inlet ports 17. The port area is controlled by aring 18 having corresponding ports 19 therein. The ring is preferablyformed with a flange 20, which rotatably fits about the tube 10 Forwardly of the an ironing plate 21. This ironing plate is imperforateand spaced from the plate 14. The ironing plate 21 is provided with aflange 22, which envelops the flaring end portion of the sleeve 16.Screws 23 are threaded through the flange 22 and have their inner endsdisposed in sockets 24 in the part 16 whereby to hold the flange 22spaced from the member 16 and from the peripheral edge of the perforatedplate 15.

A pocket 25 is formed in the lower portion of the ironing plate 21 andflange 22 and in this pocket is disposed a scraping blade 25 adapted toproject beyond the outer edge of the ironing plate 21. The degree of theprojection of this scraper blade 25 is determined by a cam 26 mounted inthe pocket 25 and operable through a stem 27 and hand wheel 28 which isaccessible from the exterior.

In the use of the device, the attachment is applied to the usual form ofhand torch by simply slipping the tube 10 over the nozzle 8; whereuponthe device is in condition for use. The flame from the blow torch willenter the tube 10 and be directed toward the chamber 29 in back of theperforated plate 15. In this chamber the flame and other products ofcombustion will receive quantities of air through the ports 17 and 19.By rotating the cut-off ring 18, as indicated in Figure 3, the ports 17and 19 may be moved into and out of registry or into partial registry sothat the amount of air entering the chamber 29 can be nicely controlled.

The air entering the chamber 29 will serve to support the combustionwhich might otherwise tend to lag owing to the confined space into whichthe flame is directed. The commingled flame and air passes through thenumerous perforations in the plate 15 and is directed through theseperforations against the ironing plate 21. As a consequence this ironingplate acquires a high degree of heat.

perforated plate 15 is The ironing plate is moved over the paintedsurface and burns the paint off such surfaces. rlhe plate is moved overthe surface by manipulation of the hand t rch which is provided with theusual handle. n the act of moving the ironing plate 21 over the surface,the scraper blade 25 will be re quired to follow up the operation ofburning the paint by scraping and removing the burned paint from thepainted surface. By rotating the handle wheel 28, the scraper blade 25may be made to project more or less from the pocket 25.

It will be appreciated from the foregoing that both burning and scrapingoperations are enabled to be carried on at one and the same time andthat the expense 0f two implements for conducting these operations isdispensed with.

lt is obvious that various changes and modifications may be made in thedetails of construction and design of the above specifically describedembodiment of this invention without departing from the spirit thereof,such changes and modifications being restricted only by the scope of thefollowing claims.

That is claimed is l. A combined burner and scraper comprising, incombination with a` hand torch having a nozzle, a tube removably fittedover said nozzle, a sleeve removably fitted over said tube and carryingin advance of the tube a perforated plate, said sleeve havlng airopenings therein, means for controllinoV the ort larea of the air oeninvs an.

ironing plate carried in advance of the perforated plate, and a scraperblade carried by the .ironing plate.

2. A combined burner and scraper comprising, in combination with a handtorch having a nozzle, a tube removably fitted over said nozzle, asleeve carried removably by said tube and having an outwardly flaringportion, a perforated plate carried by the outwardly flaring portion,said sleeve having air duct-s therein, a rotary perforated cut-oft'plate mounted in connection with said ducts, an ironing plate supportedin advance of the perforated plate, and having a flange eX- tendingabout the flaring portion, fastening means engaging the flange and theHaring portion, and scraping means carried by said ironing platef 3. Acombined burner and scraper comprising, in combination ywith a handtorch having a nozzle, a tube removably fitted over said nozzle, asleeve removably carried by said tube, perforated plate carried by thesleeve forwardly of the tube and forming chambers on both sides ofsaid'perforated plate, an ironing plate carried forwardly of saidperforated plate and having openings to the atmosphere about` the'perforated plate, said ironing plate having a pocket therein, a scraperblade mounted in said pocket, and cam means for moving the scraper bladeoutwardly in the pocket.

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